drivers/net/wireless/b43legacy/pio.h

   1 #ifndef B43legacy_PIO_H_
   2 #define B43legacy_PIO_H_
   3
   4 #include "b43legacy.h"
   5
   6 #include <linux/interrupt.h>
   7 #include <linux/list.h>
   8 #include <linux/skbuff.h>
   9
  10
  11 #define B43legacy_PIO_TXCTL             0x00
  12 #define B43legacy_PIO_TXDATA            0x02
  13 #define B43legacy_PIO_TXQBUFSIZE        0x04
  14 #define B43legacy_PIO_RXCTL             0x08
  15 #define B43legacy_PIO_RXDATA            0x0A
  16
  17 #define B43legacy_PIO_TXCTL_WRITELO     (1 << 0)
  18 #define B43legacy_PIO_TXCTL_WRITEHI     (1 << 1)
  19 #define B43legacy_PIO_TXCTL_COMPLETE    (1 << 2)
  20 #define B43legacy_PIO_TXCTL_INIT        (1 << 3)
  21 #define B43legacy_PIO_TXCTL_SUSPEND     (1 << 7)
  22
  23 #define B43legacy_PIO_RXCTL_DATAAVAILABLE       (1 << 0)
  24 #define B43legacy_PIO_RXCTL_READY               (1 << 1)
  25
  26 /* PIO constants */
  27 #define B43legacy_PIO_MAXTXDEVQPACKETS  31
  28 #define B43legacy_PIO_TXQADJUST         80
  29
  30 /* PIO tuning knobs */
  31 #define B43legacy_PIO_MAXTXPACKETS      256
  32
  33
  34
  35 #ifdef CONFIG_B43LEGACY_PIO
  36
  37
  38 struct b43legacy_pioqueue;
  39 struct b43legacy_xmitstatus;
  40
  41 struct b43legacy_pio_txpacket {
  42         struct b43legacy_pioqueue *queue;
  43         struct sk_buff *skb;
  44         struct ieee80211_tx_status txstat;
  45         struct list_head list;
  46 };
  47
  48 #define pio_txpacket_getindex(packet) ((int)((packet) - \
  49                               (packet)->queue->tx_packets_cache))
  50
  51 struct b43legacy_pioqueue {
  52         struct b43legacy_wldev *dev;
  53         u16 mmio_base;
  54
  55         bool tx_suspended;
  56         bool tx_frozen;
  57         bool need_workarounds; /* Workarounds needed for core.rev < 3 */
  58
  59         /* Adjusted size of the device internal TX buffer. */
  60         u16 tx_devq_size;
  61         /* Used octets of the device internal TX buffer. */
  62         u16 tx_devq_used;
  63         /* Used packet slots in the device internal TX buffer. */
  64         u8 tx_devq_packets;
  65         /* Packets from the txfree list can
  66          * be taken on incoming TX requests.
  67          */
  68         struct list_head txfree;
  69         unsigned int nr_txfree;
  70         /* Packets on the txqueue are queued,
  71          * but not completely written to the chip, yet.
  72          */
  73         struct list_head txqueue;
  74         /* Packets on the txrunning queue are completely
  75          * posted to the device. We are waiting for the txstatus.
  76          */
  77         struct list_head txrunning;
  78         /* Total number or packets sent.
  79          * (This counter can obviously wrap).
  80          */
  81         unsigned int nr_tx_packets;
  82         struct tasklet_struct txtask;
  83         struct b43legacy_pio_txpacket
  84                          tx_packets_cache[B43legacy_PIO_MAXTXPACKETS];
  85 };
  86
  87 static inline
  88 u16 b43legacy_pio_read(struct b43legacy_pioqueue *queue,
  89                      u16 offset)
  90 {
  91         return b43legacy_read16(queue->dev, queue->mmio_base + offset);
  92 }
  93
  94 static inline
  95 void b43legacy_pio_write(struct b43legacy_pioqueue *queue,
  96                        u16 offset, u16 value)
  97 {
  98         b43legacy_write16(queue->dev, queue->mmio_base + offset, value);
  99         mmiowb();
 100 }
 101
 102
 103 int b43legacy_pio_init(struct b43legacy_wldev *dev);
 104 void b43legacy_pio_free(struct b43legacy_wldev *dev);
 105
 106 int b43legacy_pio_tx(struct b43legacy_wldev *dev,
 107                    struct sk_buff *skb,
 108                    struct ieee80211_tx_control *ctl);
 109 void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev,
 110                                  const struct b43legacy_txstatus *status);
 111 void b43legacy_pio_get_tx_stats(struct b43legacy_wldev *dev,
 112                               struct ieee80211_tx_queue_stats *stats);
 113 void b43legacy_pio_rx(struct b43legacy_pioqueue *queue);
 114
 115 /* Suspend TX queue in hardware. */
 116 void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue);
 117 void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue);
 118 /* Suspend (freeze) the TX tasklet (software level). */
 119 void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev);
 120 void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev);
 121
 122 #else /* CONFIG_B43LEGACY_PIO */
 123
 124 static inline
 125 int b43legacy_pio_init(struct b43legacy_wldev *dev)
 126 {
 127         return 0;
 128 }
 129 static inline
 130 void b43legacy_pio_free(struct b43legacy_wldev *dev)
 131 {
 132 }
 133 static inline
 134 int b43legacy_pio_tx(struct b43legacy_wldev *dev,
 135                    struct sk_buff *skb,
 136                    struct ieee80211_tx_control *ctl)
 137 {
 138         return 0;
 139 }
 140 static inline
 141 void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev,
 142                                  const struct b43legacy_txstatus *status)
 143 {
 144 }
 145 static inline
 146 void b43legacy_pio_get_tx_stats(struct b43legacy_wldev *dev,
 147                               struct ieee80211_tx_queue_stats *stats)
 148 {
 149 }
 150 static inline
 151 void b43legacy_pio_rx(struct b43legacy_pioqueue *queue)
 152 {
 153 }
 154 static inline
 155 void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue)
 156 {
 157 }
 158 static inline
 159 void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue)
 160 {
 161 }
 162 static inline
 163 void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev)
 164 {
 165 }
 166 static inline
 167 void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev)
 168 {
 169 }
 170
 171 #endif /* CONFIG_B43LEGACY_PIO */
 172 #endif /* B43legacy_PIO_H_ */